Tubulous steam-boiler



(No Model.)

L. D. DAVIS.

TUBULOUS STEAM BOILER. No. 571,650. Patented Nov. 17, 1896 IIIIIIIIIIIIIIIlIIIIllIIllIllIIlIII/I \MLUEEEEE. magma.

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UNITED STATES PATENT 'O' rricn.

LEONARD D. DAVIS, OF ERIE, PENNSYLVANIA.

TUBULOUS STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 571,650, dated November 17, 1896.

Application filed November 26, 1895. Serial No. 570,202. (No model.)

To all whom it may concern:

Be it known that I, LEONARD D. DAVIS, a citizen of the United States, residing at the city of Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Tubulous Steam- Boilers; and I do hereby declare the following to be a full, cleanand exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being bad to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

This invention relates to certain new and useful improvements in tubulous steam-boilers audit consists,primarily, in constructing the boiler with headers, in which are secured tiers of inclined water-tubes which form the upper and lower walls of return fire-fines, and with downfiow-pipes so connecting the headers that there is a well defined and positive circulation of the water in the boiler and of the heat and products of combustion. through the fire-lines formed by said tiers of watertubes from the rear to the front of the boiler in. direct contact with every portion of the heating-surface thereof.

Another feature of my invention consists in constructing the headers of the boiler in sections, so that each front and rear section of the headers has secured therein one tier of water-tubes and a downflow-pipe at each side thereof, the front header-sections being secured together one upon the other and the rear header-sections simply resting one upon the other, whereby the tier of water-tubes and the downflow-pipes between each front and rear sections are free to expand and contract without interfering with the others.

Another feature of my invention consists in inserting the feed-water pipes some distance into the front end of each of the lowermost downflow-pipes, so that the cold feed-water is heated in its passage through these downflow-pipes toward the rear of the boiler.

Another feature of this invention consists in making the water-tubes forming the tiers connecting the header-sections either with a longitudinal rib on each side, so that when the tubes are secured in the headers these ribs overlap each other and form practically a firetight joint, or by making the water-tubes of plain tubing, with the ends thereof swaged down sufficiently so that they can be secured in the headers with the sides thereof in contact with each other, and then sealing the joints below them by stretching asbestos cords over each joint, so as to form substantially fire-tight joints between these tubes.

Other features of my invention are set forth hereinafter in the specification and claims.

In the accompanying drawings, Figure l is a front view in elevation of my improved tubulous steam-boiler. Fig. 2 is a longitudinal vertical section of the same on the line 02 a: in Fig. 1, looking in the direction of the arrow. Fig. is a rear end view of the same, partially in elevation and partially in section, 011 the line in Fig. 2, looking in the direction of the arrow. Fig. l is a transverse vertical section of the same on the line 3 3,1 in Fig. 2, looking in the direction of the arrow. Fig. 5 shows a view in detail of a section of one of the headers with water-tubes having longitudinal ribs on the sides thereof overlapping each other, so as to seal the joint between them. Fig. 6 shows a top or plan view of the detail View shown in Fig. Fig. 7 shows a view in detail of a section of one of the headers with water-tubes therein, illustrating another method of sealing the joint between the water-tubes. Fig. 8 shows a top or plan view of the detail view shown in Fig. '7.

In the construction of my improved tubulous steam-boiler illustrated in the accompanyin g drawings the front header of the boiler is constructed of sections, eachconsisting of a transverse oblong shellA, inclined upward from the center thereof to the sides of the boiler, where it joins vertical cylinders A A, these cylinders A being provided with flanges a, through which bolts a are placed, by means whereof they can be bolted together. Upon the upper of these cylinders A A is secured a stealmdrum B, so that when the cylinders A A are bolted together they form vertical passages from the ends of the shells A up into the steam-drum B. The rear header of the boiler is also constructed of sections, each consisting of a transverse oblong shell D, inclined upward from the center thereof to the sides of the boiler, where it joins vertical cylinders D D, these cylinders D" being each ICO provided with closed heads cl (1, so that there is no communication upward from one to the other, but they simply rest one upon the other. To the lowermost of the header-cylinders D D are secured downwardly-projecting pipes C O, which communicate with a mud-drum 0, provided with a blow-0E pipe 0.

Between each oblong shell Aat the front end and the corresponding shell D at the rear end of the boiler I secure a tier of straight water-tubes. E. These tubes E, I make, preferably,with longitudinal ribs 6 e on their sides, as illustrated in Figs. 5 and 6, which ribs overlap when the tubes are secured in the shells A and D of the headers, so as to form I practically fire-tight joints between the tubes,

These ribbed tubes enable me to secure their ends in openings in the header-shells A and D by expanding them therein in the usual manner, access being had thereto through screw-plugged openings a and d 'in the outer edges of the header-shells A and D, opposite the openings therein, in which the ends of the tubes E are secured. In securing these ribbed tubes in place in the header-shells A and D, I cut away the ribs 6 thereon for a sufficient distance at eachlend thereof, so that I the end of the tube will pass into the openings in the shells a suffieient'distance to permit the insertion or removal of any one or more tubes by loosening them and then moving them longitudinally when desired.

To close the openings between the ends of the tubes where the flanges e are cutaway, I

secure to the header-shells A and D angleirons e, as illustrated in Figs. 5 and 6. 'I can, however, use ordinary tubing for the tiers of water-tubes. In this case I swage the ends of the tubes down, as illustrated in Fig. 8, to a small enough size, so that when they are secured by expanding them in the openings in the header-shells the sides of the tubes will contact with each other, as illustrated in Figs. 1, 4, 7, and 8 of the drawings.

To make the joints between the tubes firetight, I draw the ends of asbestos cords 6 through between the openings formed by the swaged ends of the tubes E and stretch them along the upper sides of the joints between the tubes, as illustrated in Figs. 7 and 8. I, however, prefer the ribbed tube construction hereinbefore described. Each front headersection A A is also connected to its corresponding header-section D D at, the rear of the boiler by means of two downflow-pipes F F, connecting the cylindrical port-ions A and E of each of the header-sections together at each side of the boiler, these pipes F F being sufliciently large to convey the water passing upward through the corresponding tier of water-tubes from the front to the rear of the boiler.

The headers A A and D D when put together to form the boiler are arranged one above the other, as illustrated in the drawings, the front header-sections A A being firmly secured together by means of flanges a and bolts 0, and the rear header-sections simply rest one upon the other, and when thus placed'together the tiers of tubes E incline upward from the rear toward thefront of the boiler at an angle of, say, from fifteen to twenty degrees, and form, together with the header-shells A and D, the upper and I lower walls of inclined fire-fluesEQthe side walls of these fines being formed by vertical fire-walls G, which form the sides of the fire-' box II and flue II, and extend up between the downflow-pipcs F F and the outer tubes section D D, at the rear of the boiler is free 7 to respond to the longitudinal expansion and contraction of the water-tubes E and downflow-pipes' F F, securedtherein, without regard to the expansion and contraction of the water-tubes and downflow-pipes in the other header-sections, so that any undue strain upon the tubes and headers is thereby avoided. The feed-water is introduced into the boiler through pipes I I, which enter the cylindrical portions A A of the lower front header-section and extend rearwardly into the lower downflow-pipes F, connecting this header-section with the cylindrical portions D D of the lower rear header-section, and the feed-water as it passes rearward ly through said lowermost downfiow-pipes F F in contact with the hot water therein becomes separated from the impurities thereof, and these impurities being heavier than the water are precipitated and pass down through the pipes 0 into the mud-drum C, where they can be blown off through blow-off pipes c therein, the feed water thus purified passing on through the parts D D into the shell D of the rear header, and thence back to the front of the boiler through the lowermost tier of water-tubes E, and thence back through the second pair of downfiow-pipes F F to the second header-section D D, and again back to the front through the second tier of watertubes E until it, together with the steam generated, reaches the steam-drum B through the passage formed by the cylindrical portions A A of the header-sections at the front of the boiler, the surplus water meanwhile passing down through the cylindrical passages A A of the front header to the downfiow-pipes F F to repeat its traverse back and forth until it is reduced to steam.

In the outer sides of the cylindrical parts D of each rear header-sections D D, I pref- 1. The combination in a tubulous steamboiler, of front and rear headers having openin gs therethrough for the passage of the products of combustion, and water-tubes secured in said headers in close proximity to each other, so as to form with the openings in the headers substantially fire-tight fire-ii ue walls, substantially as and for the purpose set forth.

2. The combination in a tubulous steamboiler, of a front header consisting substantially of transverse sections, having openings between them for the passage of the products of combustion, and vertical ends on said transverse sections adapted to be secured together and formv vertical passages therefrom, a steam-drum secured to the ends of the uppermost header-section, arear header consisting substantially of transverse central sections having openings between them for the passage of the products of combustion, and vertical ends provided with closed heads resting upon, but not communicating with each other, water-tubes secured in the transverse portion of each front header-section and in the corresponding rear header-section in close proximity to each other, so as to form with the front and rear headers substantially firetight upper and lower return fire-flue walls, and downfiow-pipes secured in the ends of each front header-section and .in the ends of the corresponding rear header-section at the sides of the boiler, substantially as and for the purpose set forth.

3. The combination in a tubulous steamboiler, consisting substantially of tiers of water-tubes secured in front and rear headers, and a downtlow-pipe, connecting said headers at each side of the boiler, corresponding to each tier of watentubes, of feed-water pipes extending into the front ends of the lower pair of downilow-pipes, and a mu d-drun1 communicating with the lower portion of the header at the rear of the boiler, substantially as and for the purpose set forth.

4. The combination in a tubulous steamboiler, of a front header constructed of sections, each consistingsubstantially of a transverse shell, cylindrical ends on the ends of said shell, flanges on said cylindrical ends, whereby they can be secured together so as to form vertical passages up to the steamdrum secured to the topmost section, and a rear header constructed of sections, consist ing substantially of transverse shells having cylindrical ends, the ends of which are closed and resting one upon another, substantially as and for the purpose set forth.

5. The combination in a tubulous steamboiler, of a front header constructed of sections, each consisting substantially of a transverse shell inclined upward from the center toward the ends thereof, flanged cylindrical ends on said shells whereby said cylindrical ends can be secured together one above the other, so as to form continuous vertical passages up to a steam-drum secured to the uppermost section of the header, a rear header consisting substantially of a transverse shell inclined upward from the center toward the ends thereof, cylindrical ends on said shells, provided with closed heads, so that when the cylindrical end of one section is placed upon another there is no communication between them, and a tier of water-tubes secured between the shells and downflow-pipes between the cylindrical ends of the corresponding front and rear headersections, substantially as and for the purpose set forth.

6. The combination in the header-sections of a tubulous steam boiler, of transverse shells inclined upward from the center toward the ends thereof, and adapted toreceive the ends of water-tubes secured therein, in close proximity to each other and vertical sections at each end of said shells adapted to be secured together and to a steam-drum, so .as to form vertical passages at the sides of the boiler, from the ends of said shells to the steam-drum of the boiler, substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

LEONARD D. DAVIS.

Witnesses FRED EINFELDT, II. J. Conrzn. 

